Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Consolidated net loss	$ (56,150)	$ (56,863)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation	601	1,198
Impairment of fixed assets	0	242
Increase in fair value of Symphony Icon, Inc. purchase liability	1,741	1,590
Stock-based compensation	3,741	4,090
Amortization of debt issuance costs	241	25
Gain on disposal of property and equipment	(59)	(733)
Changes in operating assets and liabilities:
Decrease in accounts receivable	719	509
Increase in prepaid expenses and other current assets	(2,387)	(2,706)
(Increase) decrease in other assets	(413)	26
Increase (decrease) in accounts payable and other liabilities	(3,326)	2,692
Decrease in deferred revenue	(371)	(44)
Net cash used in operating activities	(55,663)	(49,974)
Cash flows from investing activities:
Purchases of property and equipment	(480)	(39)
Proceeds from disposal of property and equipment	334	1,517
Purchases of investments	(70,505)	(20,651)
Maturities of investments	0	60,964
Net cash provided by (used in) investing activities	(70,651)	41,791
Cash flows from financing activities:
Proceeds from issuance of common stock	0	162
Repurchase of common stock	(357)	(887)
Repayment of debt borrowings	(912)	(839)
Other financing activities	61	(27)
Net cash used in financing activities	(1,208)	(1,591)
Net decrease in cash and cash equivalents	(127,522)	(9,774)
Cash and cash equivalents at beginning of period	137,266	37,499
Cash and cash equivalents at end of period	9,744	27,725
Supplemental disclosure of cash flow information:
Cash paid for interest	3,184	896
Supplemental disclosure of non-cash investing and financing activities:
Unrealized gain on investments	$ 161	$ 3